docs(openspec): plan shop coupons, accounts, points, flash sales, and group buying

Capture exclusive promotion composition, empty-group cancel, and mall surface scope so the five marketing changes can be implemented without stacking or lifecycle ambiguity. Co-authored-by: Cursor <cursoragent@cursor.com>
2026-09-18 17:32:08 +08:00
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+## ADDED Requirements
+
+### Requirement: Merchant coupon management
+Shop users SHALL manage only their shop's coupon templates from shop-admin, including localized title, amount and threshold in minor units, currency, claim stock, active window, and enabled state. Shop-admin SHALL expose a coupons navigation entry beside existing shop operations.
+
+#### Scenario: create an active template
+- **WHEN** a shop owner creates a valid coupon template
+- **THEN** the template is available for eligible customers to claim during its active window
+
+#### Scenario: coupons appear in shop navigation
+- **WHEN** an authenticated shop user opens shop-admin
+- **THEN** a coupons management entry is reachable without leaving the shop-scoped console